Water-front and fire-box for boilers



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J. T. OHAREST. WATER FRONT AND FIRE BOX FOR BOILERS.

v No. 475,035,

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J. T. CHAREST. 7 WATER FRONT AND FIRE BOX FOR BQILERS. No. 475,035.Patented May 17, 1892.

FIG 3 (No Model.) 3 Sheets-Sheet 3.

' J. T. GHAREST.

WATER FRONT AND FIRE BOX FOR BOILERS.

No. 475,035. Patented Mayl'7, 1892.

\ f'" u i W 2 iv 2 I14 TIIHIIIIIIIIIIHHII 1 9 R P ooboo I oooqgpo 0Lillllll-lunlu-mu JOHN T.

PATENT GEEICE.

CHAREST, OF RED BLUFF, CALIFORNIA.

WATER-FRONT AND FIRE-BOX FOR BOILERS.

SPECIFICATION forming part of Letters Patent No. 475,035, dated May 17,1892.

Application filed June 24:, 1891. Serial No. 397,385. (No model.)

T0 on whom it may concern.-

Be it known that I, JOHN T. CHAREST, a citizen of the United States,residing at Red Bluff, Tehama county, State of California, have inventedan Improvement in lVatcr- Fronts and Fire-Boxes for Boilers; and Ihereby declare the following to be a full, clear, and exact descriptionof the same.

My invention relates to a water-front and fire-box attachment forboilers; and it consists in certain details of construction inconnection with these parts, all of which will be more fully explainedby reference to the accompanying drawings, in which Figure l is a sideelevation with the side wall removed to show the interior construction.Fig. 2 is a front of the boiler. Fig. 3 is a rear view of thebridge-wall G. Fig. 4: is a View of the rear walls and boiler, showingthe pipe connection. Fig.5 is a transverse section taken across thefurnace in line a: a", Fig. 1. Fig. 6 is a section of the front wall andrear bridge-wall, showing the manner of securing the pipes in place.

A is the front of a boiler-furnace, which is made with the upper partfitted to receive and support one or more boilers B. This front is madewith the front and rear walls separated from each other, so as to leavea water-space of any suitable dimensions between them, and the walls areheld together by any suitable number of stay-bolts which will retainthem in the proper position. The usual fire and ash door openings aremade through the front, connecting with the inte' rior of the furnace.

At the rear of the furnace is the hollow bridge-wall C, which is madesimilar in every respect to the front A; but the concavity or space inthe top is sufficiently below the bottom of the boiler to allow theflames and products of combustion from the furnace to pass over thiswall and into the combustion-chamber in the rear, which will behereinafter more fully described. This bridge-wall is also somewhatnarrower than the front A, in order to allow the structure to beintroduced or removed after the permanentsurrounding brick walls of theboiler-setting have been built.

Between the front A and the bridge-wall C extend the pipes D. Thesepipes are arranged in single or double series upon each side of thefurnace and interior to the side walls of the boiler-setting. They maybe about two and one-half inches in diameter, and if set in singlevertical rows are sufficiently close together to allow the flames andheat to circulate around them inside of the brick setting. If made indouble rows, as shown in Fig. 5, the inner and outer tubes upon eachside will alternate, so as not to occupy the same horizontal planes,thus allowing the heat to circulate more freely among them. At thebottom upon each side the large tubes E, which may be about six inchesin diameter, connect the front wall A and the bridge-wall C, these tubeshaving screw-threads out upon them and screwing through the washers orcollars F,Which are correspondingly threaded and fit against the innorwalls of the front and bridge-wall, respectively. These tubes screwthrough the collars and into the inner walls of the front andbridge-wall, respectively, thus forming a large open communication atthe bottom and below the level of the fire-grate, so that any sedimentwhich is deposited from the water will gradually accumulate in theselarge tubes, which serve as mud-dru ms.

The rear ends of the tubes D, which are of the usual thin boiler-tubematerial, have welded onto them thicker tubes of iron, which allowsscrew-threads to be out upon it without dangerously weakening the tubeand so that the rear ends of these tubes may screw into the front plateof the bridge-wall to form connection therewith. The front ends of thesetubes are expanded and fitted into the rear wall of the front A in theusual manner for securing boiler-tubes. In order to do this work, thefront wall of the front A has holes made in it in line with each of thetubes D and E, these holes being of larger diameter than these tubes.Screw-threads are cut in the holes, and in these holes are fittedthimbles G, which screw into them, as shown. These thimbles have aninterior diameter sufficient to allow the tubes D to be introduced orremoved through them, and as the thimbles remain in place during thisoperation the screw-threads in the boiler front are protected andprevented from being abraded or worn when this operation takes place.The outer ends of these thimbles are closed by brass caps I-I, threadedupon the inside to fit upon the corresponding exterior threads of thethimbles. By removing these caps at any time access to the tubes may behad and any one or more of them removed or replaced when necessary.

From the upper part of the boiler front, upon each side, pipes I connectwith the front head of the boiler, opening through it, and thus allowinga free circulation of water between the boiler front and the boileritself. These pipes may be provided with cocks or valves J, by whichcommunication between the boiler and the front may be cut elf atpleasure, as for the purpose of repairs or for other reasons.

In the present case I have represented the boiler as about fourteen feetin length, of the tubular pattern, having an uptake and smokestack atthe front,.th rough which the products of combustion returnfrom the rearend. The furnace may approximate about six feet in length, and in thespace between the bridgewall C and the rear brick wall K of the furnaceI build an intermediate wall L. This wall extends across between theside walls of the boiler-setting, about two feet from. the rear wall,and has a sufficient space between itsupper surface and the bottom ofthe boiler to allow the products of combustion to pass freely into thespace behind it, which is termed the back connection. This provides asupplemental chamber between the bridge-wall C and the wall L, in whichthe hot gases and products of combustion are checked, and an eddy isformed, which greatly assists in heating this portion of the boiler andin preventing a too-rapid passage of the hot gases. From the backconnection these gases return through the boiler-fines and produceadditional heat therein, eventually passing out through the uptake andsmoke-stack.

M is a pipe connecting with the bottom of the hollow bridge wall C,extending out through the walls L and K, as shown in the present case,and connecting directly in line with the blow-0E cock N.

O is the feed-water pipe, which in the present case connects with thepipe M, opening into one side of it.

P is a cock by which connection between the feed-water pipe and the pipeM may be cut off or opened at pleasure.

Q is a pipe connecting with the rear of the boiler near the bottom anduniting with the pipe M, andRisa cock situated at some point between thepipe M and the boiler, by which communication may be cut off. I havehere shown these pipes foreonvenience extending through the rear wall ofthe boiler-setting; but it will be manifest that they may be connectedwith the bottom of the bridge-wall, so as to open out through one of theside walls of the boiler-setting, if convenient or preferable. As hereshown, the same pipe M serves to receive the feed-water under ordinaryconditions and deliver it into the lower part of the bridge-wall, fromwhich it is distributed through all the connecting-pipes of the sidesand to the hollow boiler front and thence to the boiler.

When for any reason it is desired toprovide direct circulation betweenthe rear end of the boiler and the bottom of the bridge wall, and cocksR and P being opened, the cockN of course being closed, the circulationwill take place freely and continuously.

When it is desired to clean out the pipes, boiler front, andbridge-wall, the cooks J and R, connecting with the boiler, may beclosed, and the cock S, connecting with the feed-water inlet, being alsoclosed, the cocks P and N are opened and the steam-pressure within willblow out all the sediment which mayhave collected in the bottom of thewalls A and C and in. the pipes E. The boiler itself maybe blown off ina similar manner by opening the cock R, which communicates directly withthe blow-01f N. Thus the whole apparatus may be effectually cleaned outwhenever desirable.

Hand-hold plates T are fitted to the boiler front and the bridge-wall Cin line with the pipes E, so that access may be had to them at any time.

By this construction it will be seen that this boiler front and furnacemay be applied to any boiler which is already set up, as the bridge-wallcan be introduced between the side walls and beneath the boiler, and theboiler front, taking the place of the ordinary front, will abut againstthe front ends of the side walls or be set into them, after which thetubes D and E, connecting these, may be introduced and secured in placeand the gratebars placed and supported in the usual manner.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. A boilerfurnace having the surrounding walls, the independent hollowfront havin g front and rear walls separated from each other to form awater-space, a hollow bridgewall having separated front and rear walls,the pipes D, connecting the hollow front and bridge-wall, and the lowertubes E, having a larger diameter than the tubes D and having their endsthreaded and fitted to collars on the inner walls of the hollow frontand bridgewall, said tubes E beins, below the level ofthe grates,substantially as herein described.

2. A boiler-furnace having the surrounding walls and the independenthollow front and hollow bridge-wall, with the side connecting pipes, asshown, in combination with the feed-pipe and hollow blow-offcockconnecting with the bottom of the bridge-wall and the supplemental pipeQ, connecting said pipes with the rear of the boiler and having thecocks, substantially as herein described.

A boiler-furnace having the surrounding walls, independent hollow ironfront and hollow bridge-wall, with the side connectingtubes within theouter side walls of the furnace, said tubes having the rear endsthickened and screw-threaded so as to screw into the front wall of thehollow bridge-wall, thefront ends of the tubes being expanded within therear wall of the hollow front, holes made in the front Wall of the frontinline with said tubes, having thimbles of larger diameter than thetubes screwthreaded and fitting into said holes, whereby the tubes mayberemoved to through the thimbles and the screw-threads protected frominjury, and exterior caps fitting over the thimbles and closing the endsthereof, substantially as herein described.

In witness whereof I have hereunto set my hand.

JOHN T. CHAREST.

Witnesses:

S. H. NOURSE, J. A. BAYLESS.

